Agree to take up residence (6)
I believe the answer is:
settle
I believe this clue is a double definition.
'agree' is the first definition.
(I know that settle is a more specific form of the action agree)
'take up residence' is the second definition.
(as in settling in a new town)
'to' is the link.
(Other definitions for settle that I've seen before include "Come to rest; bench" , "form" , "High-backed bench" , "Become established and pay debt" , "Light upon" .)